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The symbol ∆ denotes one of the four arithmetic operations:addition,su

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The symbol ∆ denotes one of the four arithmetic operations:addition,su  [#permalink]

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New post 22 Jun 2017, 16:18
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The symbol ∆ denotes one of the four arithmetic operations:addition,subtraction,multiplication,or division,If 6∆3≤ 3 ,which of the following must be true ?

I. 2∆2 = 0
II. 2∆2 = 1
III. 4∆2 = 2

A. I only
B. II only
C. III only
D. I and II only
E. I, II, and III

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Re: The symbol ∆ denotes one of the four arithmetic operations:addition,su  [#permalink]

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New post Updated on: 22 Jun 2017, 17:58
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AbdurRakib wrote:
The symbol ∆ denotes one of the four arithmetic operations: addition,subtraction,multiplication,or division. If 6∆3≤ 3, which of the following must be true ?

I.2∆2=0
II.2∆2=1
III.4∆2=2

A. I only
B. II only
C. III only
D. I and II only
E. I, II, and III

If 6 ∆ 3 ≤ 3, the ∆ operator is subtraction AND division.

6 - 3 = 3, which satisfies the equation

\(\frac{6}{3}\) = 2, which also satisfies the equation (2 is less than 3).

The operator cannot be addition or multiplication. 6 + 3 = 9, which is > 3. And 6 * 3 = 18, also > than 3.

Check I, II, and III.

I. 2 ∆ 2 = 0. If ∆ were only subtraction, this would be fine. 2 - 2 = 0.

But \(\frac{2}{2}\) = 1. This equation is not true when ∆ is division. Incorrect.

II. 2 ∆ 2 = 1. If ∆ were only division, this would be fine.\(\frac{2}{2}\) = 1. But from above, 2 - 2 = 0. This equation does not holds true when ∆ is subtraction. Incorrect.

III. 4 ∆ 2 = 2. This must be true for both subtraction and division.

It holds for subtraction. 4 - 4 = 2.
And it holds for division: \(\frac{4}{2}\)= 2. Correct.

Answer C
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Originally posted by generis on 22 Jun 2017, 17:43.
Last edited by generis on 22 Jun 2017, 17:58, edited 2 times in total.
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Re: The symbol ∆ denotes one of the four arithmetic operations:addition,su  [#permalink]

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New post 22 Jun 2017, 17:49
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AbdurRakib wrote:
The symbol ∆ denotes one of the four arithmetic operations:addition,subtraction,multiplication,or division,If 6∆3≤ 3 ,which of the following must be true ?

I.2∆2=0
I I .2∆2=1
I I I .4∆2=2

A. I only
B. II only
C. III only
D. I and II only
E. I, II, and III


\(6∆3≤ 3\)

\(\frac{6}{3}= 3\)

\(6-3 = 3\)

Therefore symbol ∆ should be division and subtraction both.

Checking the options, we get;

I.\(2∆2=0\)

\(2 - 2 = 0\)

\(\frac{2}{2}= 1\)------------ Must Not be true.

II .\(2∆2=1\)

\(\frac{2}{2}= 1\)

\(2 - 2 = 0\) --------------- Must Not be true.

III .\(4∆2=2\)

\(\frac{4}{2} = 2\) --------- Must be true.

\(4 - 2 = 2\) --------- Must be true.

Hence Only III must be true. Answer (C)...
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Re: The symbol ∆ denotes one of the four arithmetic operations:addition,su  [#permalink]

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New post 23 Jun 2017, 01:59
AbdurRakib wrote:
The symbol ∆ denotes one of the four arithmetic operations:addition,subtraction,multiplication,or division,If 6∆3≤ 3 ,which of the following must be true ?

I.2∆2=0
I I .2∆2=1
I I I .4∆2=2

A. I only
B. II only
C. III only
D. I and II only
E. I, II, and III

∆ could be either Subtraction or Division in order to fulfill condition 6∆3≤ 3
I - 2∆2=0 - In this condition, ∆ denotes only subtraction and not Division. Hence Wrong
II - 2∆2=1 - In this condition, ∆ denotes only Division and not subtraction. Hence Wrong
III - 4∆2=1 - In this condition, ∆ denotes either Division or subtraction. Hence Correct.

hence, Answer C
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Re: The symbol ∆ denotes one of the four arithmetic operations:addition,su  [#permalink]

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New post 23 Jun 2017, 02:24
From the context, \(∆= subtraction and division\)
∆= subtraction\(6-3<=3\)
∆= division\(\frac{6}{3}=2<=3\)

From the options
Only iii holds true as 4∆2=2( both division and subtraction)

Option c
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Re: The symbol ∆ denotes one of the four arithmetic operations:addition,su  [#permalink]

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New post 26 Jun 2017, 18:00
1
AbdurRakib wrote:
The symbol ∆ denotes one of the four arithmetic operations:addition,subtraction,multiplication,or division,If 6∆3≤ 3 ,which of the following must be true ?

I.2∆2=0
I I .2∆2=1
I I I .4∆2=2

A. I only
B. II only
C. III only
D. I and II only
E. I, II, and III


Let’s analyze the given inequality:

If ∆ = addition:

6 + 3 ≤ 3

9 ≤ 3

Since 9 is not less than 3, ∆ cannot be addition.

If ∆ = subtraction:

6 - 3 ≤ 3

3 ≤ 3

Since 3 is less than or equal to 3, ∆ can be subtraction.

If ∆ = divison:

6/3 ≤ 3

2 ≤ 3

Since 2 is less than or equal to 3, ∆ can be division.

If ∆ = multiplication:

6 x 3 ≤ 3

18 ≤ 3

Since 18 is not less than or equal to 3, ∆ cannot be multiplication.

We see then that ∆ is either subtraction or division. Now let’s analyze each Roman numeral:

I. 2∆2=0

Since 2/2 does not equal 0, division doesn’t work and I is not true.

II. 2∆2=1

Since 2 - 2 does not equal 1, subtraction doesn’t work and II is not true.

III. 4∆2=2

Since 4 - 2 = 2 and 4/2 = 2, III is true.

Answer: C
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Re: The symbol ∆ denotes one of the four arithmetic operations:addition,su  [#permalink]

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New post 27 Jun 2017, 15:49
Top Contributor
AbdurRakib wrote:
The symbol ∆ denotes one of the four arithmetic operations:addition,subtraction,multiplication,or division,If 6∆3≤ 3 ,which of the following must be true ?

I. 2∆2=0
II. 2∆2=1
III. 4∆2=2

A. I only
B. II only
C. III only
D. I and II only
E. I, II, and III


The above solutions are perfect.
I just want to point out that, when answering this type of question type (where the answer choices are I only, II and III only, etc.), be sure to ELIMINATE answer choices after examining each statement.

So, for example, once we determine that statement I need not be true, we can ELIMINATE answer choices A, D and E
Then, once we determine that statement II need not be true, we can ELIMINATE answer choice B

At this point, there's no need to check statement III, since we already know that the correct answer must be C

Cheers,
Brent
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Re: The symbol ∆ denotes one of the four arithmetic operations:addition,su  [#permalink]

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New post 10 Jul 2017, 12:43
1
AbdurRakib wrote:
The symbol ∆ denotes one of the four arithmetic operations:addition,subtraction,multiplication,or division,If 6∆3≤ 3 ,which of the following must be true ?

I.2∆2=0
I I .2∆2=1
I I I .4∆2=2

A. I only
B. II only
C. III only
D. I and II only
E. I, II, and III




I read the options as

III (.4)∆2=2

and got it all wrong!!

That dot, right after the Roman Numerals, is so confusing...!
The dot is closer to the digit, rather, it should be closer to the Roman numeral, to avoid any confusion! So I suggest, this question must be edited!

Thanks,
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Re: The symbol ∆ denotes one of the four arithmetic operations:addition,su  [#permalink]

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New post 10 Jul 2017, 12:48
ashygoyal wrote:
AbdurRakib wrote:
The symbol ∆ denotes one of the four arithmetic operations:addition,subtraction,multiplication,or division,If 6∆3≤ 3 ,which of the following must be true ?

I.2∆2=0
I I .2∆2=1
I I I .4∆2=2

A. I only
B. II only
C. III only
D. I and II only
E. I, II, and III




I read the options as

III (.4)∆2=2

and got it all wrong!!

That dot, right after the Roman Numerals, is so confusing...!
The dot is closer to the digit, rather, it should be closer to the Roman numeral, to avoid any confusion! So I suggest, this question must be edited!

Thanks,
ashygoyal


Edited as suggested. Thank you.
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Re: The symbol ∆ denotes one of the four arithmetic operations:addition,su  [#permalink]

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New post 10 Jul 2017, 23:21
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AbdurRakib wrote:
The symbol ∆ denotes one of the four arithmetic operations:addition,subtraction,multiplication,or division,If 6∆3≤ 3 ,which of the following must be true ?

I. 2∆2 = 0
II. 2∆2 = 1
III. 4∆2 = 2

A. I only
B. II only
C. III only
D. I and II only
E. I, II, and III


6∆3≤ 3

So, 6 - 3 = 3
6/3 = 2

I. 2∆2
2-2 = 0
2/2 = 1
So it may be true.

II. 2∆2
2-2 = 0
2/2 = 1
So it is may be true.

III. 4∆2
4-2 = 2
4/2 = 2
So, 4∆2 = 2 must be true.

Answer C.
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Re: The symbol ∆ denotes one of the four arithmetic operations:addition,su  [#permalink]

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New post 11 Jul 2017, 01:06
AbdurRakib wrote:
The symbol ∆ denotes one of the four arithmetic operations:addition,subtraction,multiplication,or division,If 6∆3≤ 3 ,which of the following must be true ?

I. 2∆2 = 0
II. 2∆2 = 1
III. 4∆2 = 2

A. I only
B. II only
C. III only
D. I and II only
E. I, II, and III


6∆3≤ 3
∆ can denote subtraction or division .
6+3=9 and 9> 3
6*3 = 18 and 18 >3

I. 2∆2 = 0 , If ∆ is division , then the expression is invalid

II. 2∆2 = 1 , If ∆ is subtraction , then the expression is invalid
III. 4∆2 = 2 - Correct

Answer C
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Re: The symbol ∆ denotes one of the four arithmetic operations:addition,su  [#permalink]

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New post 21 Aug 2017, 22:40
1
Thinking that even one criteria satisfies the condition, I have interpreted that all three options are valid

Since the question says 6∆3=<3
6/3 = 2
6-3 = 3
I applied the conditions individually for all three and opted for E.
But didn't strike that one of the option should satisfy both conditions.
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Re: The symbol ∆ denotes one of the four arithmetic operations:addition,su  [#permalink]

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New post 09 Jan 2018, 18:39
Hi All,

We're told that the symbol # denotes one of the four arithmetic operations: addition, subtraction, multiplication, or division and that 6#3 <= 3. We're asked which of the three Roman Numerals must be true.

To start, let's do a bit of analysis on the inequality that we're given (and determine which math operation COULD fit this):
6#3 <= 3

6 + 3 = 9 which is NOT <= 3
6 - 3 = 3 which IS <= 3
(6)(3) = 18 which is NOT <= 3
6/3 = 2 which IS <=3

Thus, the symbol # must be either subtraction or division (although we don't know which one for sure).

I. 2#2 = 0

We've proven that the symbol is either subtraction or division, so let's see if either of those operations 'fits' this information...
2 - 2 = 0
2/2 = 1
Thus, if the symbol is subtraction, then Roman Numeral 1 IS true. However, if the symbol is division, then Roman Numeral 1 is NOT true. There's no way to know which symbol is involved though, so Roman Numeral 1 is not necessarily true.
Eliminate Answers A, D and E.

II. 2#2 = 1

With the work that we've done in Roman Numeral 1 (above), we already know that the outcome of 2#2 could be 0 or 1. This inconsistency also provides that Roman Numeral 2 is not necessarily true.
Eliminate Answer B.

There's only one answer remaining....

III. 4#2 = 2

You can still prove that Roman Numeral 3 is always true...
4 - 2 = 2
4/2 = 2
Both outcomes 'fit' the information in Fact 3, so regardless of what operation is represented, the statement IS true.

Final Answer:

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Re: The symbol ∆ denotes one of the four arithmetic operations:addition,su &nbs [#permalink] 09 Jan 2018, 18:39
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